Drill bit



Feb. 23, 1965 w. L. CHAUVIN DRILL BIT Filed Sept. 13, 1962 INVENTOR.

United States Patent O DRILL BIT Willie L. Chauvin, P.0. Box 206, Houma,La. Filed Sept. 13, 1962, Ser. No. 223,325

4 Claims. (Cl. 175-270) the drill bit, and use the drill bit over andover again.

Another object of the present invention is to provide an exploratorydrill bit which is inexpensive to manufacture, one which may be made inany size desirable, and one having means for partially disassembling ofthe bit at the bottom of a hole drilled by the bit.

A further object of the present invention is to provide an exploratorydrill bit which is sturdy in construction, one simple in structure, andone which is highly eifective in action.

These and other objects and advantages of the present invention will befully apparent from the following descrlption when taken in connectionwith the annexed drawing, in which:

FIGURE 1 is an elevational view of the drill bit of the presentinvention, a portion at the' upper end being broken away,

FIGURE 2 is a view taken on the line 2-2 of FIG- URE l,

FIGURE 3 is a cross-sectional elevational view taken on the line 33 ofFIGURE 2, and is a view in crosssection rotated 90 from the view shownin FIGURE 1.

Referring in detail to the drawing in which like numerals indicate likeparts throughout the several views,- in FIGURES 1 to 3, the referencenumeral designates an upright sleeve adapted to be secured to the lowerend of a tubular drill rod or the like, the drill rod not being shown.

Depending from and exteriorly of the sleeve 10 are three teeth 12, 14,16.

Associated with and spaced from the tooth 14 is an upright bar 18parallel to the tooth 14 and forming with the tooth 14 a slot 20defining a keeper for a bridge element 22 normally extendingdiametrically across the lower end of the sleeve 10 and having one endhingedly 3,170,526 Patented Feb. 23, 1965 element 22 are a pair of teeth46 and 48, one on each side Ofhthe element '22, and staggered withrespect to each 0t er.

A nut 50 having a cotter pin 52 therethrough, secures the bolt 32 in itsposition supporting the one end of the bridgeelement 22 on the sleeve10. Y I In construction and use, the tooth 14 and the bar 18 constituteslot-forming support members for receiving the bridge element 22,and thebar 24 and tooth 26 constitute slot-forming holding members when thewire 36 is applied.

The drill bit of the present invention is attached to the lower end of adrill rod and the drill rod is reciprocated and rotated in theconventional manner drilling a-hole with the teeth of the drill bit,suitable flushing material being pumped into the sleeve 10 and removedtherefrom as is standard practice in drilling an exploratory hole.

When the hole is completed, it is only necessary to drop a heavy weightor tool into the sleeve 10 to break the wire 36 and permit the swingingmovement of the bridge element 22 from its normal bridging position to aposition out of the way and below the sleeve 10 so that the user of thedrill bit may lower an explosive charge down the hole and through thesleeve 10 to the bottom of the hole, permitting the withdrawing of thesleeve 10 and its attached teeth for re-use in another hole.

connected to the sleeve 10 for swinging movement from sleeve 10, theswinging movement being shown in dotted lines in FIGURE 3.

The means connecting the bridge element 22 to the sleeve 10 for swingingmovement consists in' a bar 24 and tooth 26 arranged vertically withrespect to the sleeve 10 and on the outside of the sleeve 10diametrically opposite the tooth 14 and bar 18.

The bar 24 and tooth 26 are provided with aligned holes 28 and 30,respectively, as shown in FIGURE 2, and-a bolt 32 has its shankextending through the holes 28 and 30 and througha hole 34 provided inthe bridge element 22.

Means is provided for releasably holding the bridge element 22 in thebridging position. This means consists in a soft iron wire 36 extendingthrough holes 38, 40, and 42 in the tooth 14, the bridge element 22, andthe bar 18, respectively, as shown in FIGURE 2 in dotted lines.

The wire 36 is twisted upon itself to form a knot 44 after it has beeninserted through the tooth 14, the bridge element 22, and the bar 18.

Depending from the central portion of the bridge Additional embodimentsof the invention in this specification will occur to others andtherefore it is intended that the scope of the invention be limited onlyby the appended claims and not by the embodiment described hereinabove.Accordingly, reference should be made to the following claims indetermining the full scope of the invention.

What is claimed is:

1. In a drill bit including an upright sleeve for attachment to atubular drill rod, and at least one tooth and bar each projecting belowthe lower end of said sleeve spatially of each other and each disposedsubstantially exteriorly of said sleeve and in substantially parallelrelation to each other, a bridge element normally extendingdiametrically across the lower end of said sleeve and having one endthereof hingedly connected between the tooth and the bar on said sleevefor swinging movement from the normal position to a generally verticalposition below said sleeve, another tooth and bar spatially disposed toeach other and projecting below the lower end of the sleevediametrically opposite said one tooth and bar, at least one toothcarriedby said bridge'eleme'nt for eliminating any core being formed by thetooth on the sleeve, and rupturable' means operatively connected to thetooth and the bar on said sleeve for releasably holding the other end ofsaid bridge element in the normal position in the space between theother tooth and bar.

2. In a drill bit including an upright'sleeve for attachment to atubular drill rod, and a pair of teeth and bars each diametricallydisposed about and projecting below the lower end of said sleeve anddisposed substantially exteriorly of said sleeve and forming supportmembers, a bridge element normally extending diametrically across thelower end of said sleeve and having one end thereof hingedly connectedto one of said support members by a bolt for providing swinging movementfrom the normal position to a generally vertical position below saidsleeve, at least one tooth carried by said bridge element centrallythereof for eliminating any core from being formed in the sleeve, andrupturable means operatively connected to the tooth and the bar of saidsleeve releasably holding the free end of said bridge element in thenormal position.

3. In a drill bit including a cylindrical upright sleeve v v a forattachment to tubular drill rod, anda tooth and bar each projectingbelow the lower end of said sleeve and at each side of the sleeve anddisposed substantially exteriorly of said sleeve at diametricallyopposite positions r thereof and forming support members, a bridgeelement normally extending diametrically across the lower end of saidsleeve and having one end thereof hingedly connectedfrom one of saidsupport members for swinging movement from the normal position to agenerally upright position below saidvslee've, at least one. tooth car-'ried by said bridge element centrally thereof for eliminating any corebeing formediin said sleeve, the other of sleeve for atforming supportmembers having a slot, a bridge element normally extending diameh'icallyacross the lowerfenrl of said sleeve and having one end thereof hingedlycontachrnent to a tubular drill rod, and a tooth and bar each 1projecting below the lowerend of said sleeve and each disposed atsubstantially diametrical points of said sleeve nected from one of saidsupport members for swinging movement from the norm'al'position to agenerally upright position below said sleeve, at least one tooth car-'ried by said bridge element centrally thereof, .and rupturable'meansembodying asoft iron Wire releasably se curing the other end 'ofsaid bridge element to the other of the support members.

ReferencesiCited by the Examiner V UNITED STATES PATENTS} 5 1,944,8483/35 Baker g 1'75 3s1 2,252,168 8/41 Creighton 175-404); 2,490,208 12/49Conklin 175 103 2,873,950 2/59 Kandle 175- 396 X- CHARLES E. OYCONNELL,VPrimar irxmifier.

BENJAMIN BENDETT, Examiner. r.

1. IN A DRILL BIT INCLUDING AN UPRIGHT SLEEVE FOR ATTACHMENT TO ATUBULAR DRILL ROD, AND AT LEAST ONE TOOTH AND BAR EACH PROJECTING BELOWTHE LOWER END OF SAID SLEEVE SPATIALLY OF EACH OTHER AND EACH DISPOSEDSUBSTANTIALLY EXTERIORLY OF SAID SLEEVE AND IN SUBSTANTIALLY PARALLELRELATION TO EACH OTHER, A BRIDGE ELEMENT NORMALLY EXTENDINGDIAMETRICALLY ACROSS THE LOWER END OF SAID SLEEVE AND HAVING ONE ENDTHEREOF HINGEDLY CONNECTED BETWEEN THE TOOTH AND THE BAR ON SAID SLEEVEFOR SWINGING MOVEMENT FOR THE NORMAL POSITION TOA GENERALLY VERTICALPOSITION BELOW SAID SLEEVE, ANOTHER TOOTH AND BAR SPATIALLY DISPOSED TOEACH OTHER AND PROJECTING BELOW THE LOWER END OF THE SLEEVEDIAMETRICALLY OPPOSITE SAID ONE TOOTH